Bearing structure



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BEARING STRUCTURE Original Filed Aug. '7, 1958 fllllll,

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INVENTOR. GEORGE l-lovnv $65590 L. How) a BY Elmo/WA Honor A TORNEY United States Patent 3,223,464 BEARING STRUCTURE George W. Hoddy, Gerald L. Hoddy, and Raymond A. Hoddy, Owosso, Mich, assignors to Universal Electric Company, Ownsso, Mich, a corporation of Michigan Original application Aug. 7, 1958, Ser. No. 753,695, new Patent No. 3,063,761, dated Nov. 13, 1962. Divided and this application May 24, 1962., Ser. No. 197,398 3 Claims. (Cl. 308-42) This application is a divisional application of our copending application Serial No. 753,695, filed August 7, 1958, now Patent No. 3,063,761.

This invention relates to improved bearing structures and pertains more specifically to a self-aligning bearing for a rotatable and power driven shaft.

Self-aligning bearings for shafts are not new but the present bearing has decided and wide advantages over such bearings as heretofore made, known and used. Heretofore it has been common practice to provide selfaligning bearings with a spherical shaped nose which is rotatably supported in a support or seat, but with such bearings it was necesssary to provide pressure longitudinally of the bearing and the shaft which is rotatable therein to retain the bearing in its seat. The pressure has been ordinarily provided through the medium of resilient means. Such bearings have been found to be unsatisfactory as well as costly to make and assemble. When subjected to heavy or vibrating loads, such bearings pull out of or move in their seats and thereby cause noisy operation or damage. Additionally when only a small amount of power is transmitted to the shaft these bearings will not freely align due to the pressure utilized to hold the bearings on their seats and the shaft binds and is prevented from rotating.

An advantage of the present bearing is that it requires no force to retain it in position in its seat and this attribute is due to the fact that its support or seat is directly vertically beneath the self-aligning spherical or curved portion of the bearing, that is to say perpendicular to the shaft. As a result of this, there is provided a freely selfaligning caring and a support which do not require pressure between them to maintain them in proper operating position and a bearing which can not be removed from its support or seat by load on the shaft.

The bearing has the advantage of embodying a resilient section or sections for shock absorption and these are expansible to maintain the self-aligning portion of the bearing in contact with its support or seat. This expansible feature of the bearing eliminates clearance between F the bearing and its support or seat and additionally compensates for any dimensional variation which might exist between the bearing and its support or seat in that the bearing will be inherently, automatically or manually adjustable to provide variable outside spherical diameters.

While the present improved bearing inherently aligns itself prior bearings inherently misalign themselves with the shaft. Prior bearings are supported at one end in the bearing support and the center of gravity of the shaft load on the bearing is located at the longitudinal center of the bearing. This arrangement produces a leverage in the bearing which causes the bearing to swivel in its seat and thereby tighten the shaft which causes undesirable results.

The bearing has many other desirable attributes such as the following. It is rugged; it is usable with either reciprocating, rotating, oscillating or stationary shafts, and in all instances it is positively free to align itself and will therefore not bind the shaft; it will not break down oil film because the shaft will not cock and, as a consequence, prevent uneven wear of the shaft or the bearing;

it provides the minimum of rotating friction to the shaft, and most importantly provides for more quiet operation than do bearings as heretofore known and used.

In the drawings:

FIG. 1 is a View in side elevation and partly in vertical section illustrating a bearing embodying the invention.

FIG. 2 is an end view of the bearing of FIG. 1.

FIG. 3 is an end view of a still further form of bearing seat.

FIG. 4 is a view in side elevation partly in vertical section illustrating a still further form of bearing seat.

FIG. 4a is a fragmentary view similar to FIG. 4 on an enlarged scale.

FIG. 5 is an end view of FIG. 4.

FIG. 6 is an end view of a modified form of bearing.

FIG. 7 is a view in side elevation of the bearing of FIG. 6.

FIG. 8 is a view in side elevation partly in vertical section illustrating a still further modified form of bearing.

Basically, the bearing embodying the invention comprises an element having a spherical outer surface which engages a cylindrical support, the diameter of the spherical surface being substantially equal to the diameter of the cylindrical supporting surface. In accordance with the invention, the bearing embodies a resiliency externally of the spherical surface which permits the bearing to accommodate to dimensional variations. This is achieved by providing inherent resiliency in the support or interposing resilient means between a fixed support and the spherical contacting surface, said resilient means defining the cylindrical supporting surface.

The bearing illustrated in FIGS. 1 and 2 is a construction utilizing the resilient principle, hereinbefore described, of engagement between the self-aligning portion of the bearing and the bearing seat. The motor case end D is provided with a cylindrical bearing support or seat 31. The bearing embodies a ring or sleeve 32 having a bore 33 for the reception of the shaft. Intermediate its length the sleeve is provided with a circular shaped enlargement 34 constituting the self-aligning portion of the bearing and the outer face or perimeter of this is spherical as at 35. Intermediate the surface 35 and the bearing seat or support a thin corrugated spring steel strip 36 is interposed. The outer face of this strip engages the bearing seat while the inner face of the strip engages the spherical surface 35.

The structure of FIG. 3 is a two-part resilient support and comprises a pair of strap-like elements G and H the outer ends of which are connected by bolts 62 and 63 each of which is provided with a wing nut 64 and 65 for tightening down upon its respective coil spring 66 or 67 which encircle the extending ends of the bolts. The bearing, designated as an entirety by K, can be of any of several constructions described and is supported between the straps or saddles. Intermediate their lengths each strap is provided with a curved or spherical shaped portion as at 68 and 69 for the reception of the hearing.

In the bearing support structure illustrated in FIGS. 4 and 5, L designates the support or extension generally and this might Well, but not necessarily, be one end of a motor casing. A plurality of spring fingers 70 to 81 inclusive extend axially outwardly from the support L to provide a circular tubular seat designated M. A hearing P is supported in the seat and this bearing can be of any of the types hereinbefore described. Specifically, bearing P comprises a ring or sleeve having a bore for the reception of a shaft. Intermediate its length the sleeve is provided with a circular-shaped enlargement constituting the self-aligning portion of the hearing. The outer face or perimeter of this enlargement is spherical. As shown in FIG. 4a, the outermost perimeter 34a is transversely curved to define a substantially spherical contacting surface portion which has its center aligned on the axis of the surface M and has a diameter substantially equal to the diameter of the surface M. The remaining portion 34b of the perimeter is curved away more sharply.

A further form of bearing is illustrated in FIGS. 6 and 7. This bearing can be used with any of the supports illustrated in respect to the bearings heretofore described and comprises a sleeve 125 which rotatably supports the shaft 126. Intermediate its length the bearing is provided with a circular enlargement 127 the outer face of which is spherical. A strip of spring steel designated as an entirety by X is repeated around the face of the circular enlargement 127. This strip is of a corrugated nature comprising a plurality of transversely extending protrusions 128. These protrusions in end view, as they appear in FIG. 6, have a spherical or curved surface and additionally each of the protrusions is curved throughout its length, that is to say, curved in a direction transversely of the strip just as the perimeter of the enlargement 127 is curved transversely.

The protrusions have sufficient resiliency so that the bearing with the strip thereon will automatically adjust itself to any slight variations in size of the cylindrical support, as for instance a support 31 in FIG. 1. It will be understood that there could be some variations in the size of the seat or support resulting from error in the manufacture thereof. Accordingly, this bearing will resiliently adjust or accommodate itself to its seat or support and additionally the bearing is self-centering as the hearing will rock on the spherical surfaces of the protrusions which are in engagment with the seat or support. This self-centering operation would be similar to that described in respect to the bearing appearing in FIG. 1.

FIG. 8 is a further modified form of bearing shown in combination with a bearing support or seat Y. Here the bearing comprises a sleeve 129 having intermediate its length a circular enlargement 130 the perimeter of which is spherical as at 131. A flat metallic strip or band 132 encircles the perimeter of the circular enlargement 130. A resilient strip or band 133, which is also flat, encircles the band or strip 132. This construction provides the resiliency so that the bearing will accommodate itself to the interior diameter of the seat or support Y. The self-aligning attribute of the bearing is obtained through the spherical face 31 of the enlargement 130 which face readily rocks on the under face of the strip 132 as will be readily apparent and understood from the construction illustrated in FIG. 8.

All of the bearings, if desired, may be composed of some suitable finely pulverized metal having the desired porosity so that the metal may readily absorb lubricant to provide a self-lubricating bearing. The inventive concept is not limited to the use of any particular material in the bearings. The bearings may be made in whole or in part of bronze, babbitt or some other metal. The bearings may be made in part of a metal and in part of some other material such as nylon or plastic. Any material suitable to the particular use to which the bearing is to 6 be put can be used and the material used will be dictated by the circumstances and the use to which the bearing is to be put.

We claim:

1. A self-aligning bearing structure for a motor shaft and the like comprising a bearing member having a ring and a bore for the reception of a shaft,

a motor housing or the like,

an extension having one end thereof immovably fixed to said motor housing and circumscribing a cylindrical supporting surface and has radially yieldable portions,

said bearing member having an outer perimeter which is transversely curved to define a substantially spherical contacting surface portion,

said spherical contacting surface having its center aligned substantially on the axis of the cylindrical supporting surface and having a diameter substantially equal to the diameter of the cylindrical supporting surface,

said cylindrical supporting surface having a longitudinal extent sufficient to permit relatively unrestrained axial movement of said bearing member relative to said supporting surface.

2. The combination set forth in claim 1 wherein said extension includes a plurality of axially extending slots, said slots defining said radially yieldable portions.

3. A self-aligning bearing structure for a motor shaft and the like comprising a bearing member having a ring and a bore for the reception of a shaft,

a motor housing or the like,

an extension having one end thereof immovably fixed to said motor housing and circumscribing a cylindrical supporting surface,

said extension having axially extending slots which define radially yieldable fingers, said bearing member having an outer perimeter which is transversely curved to define a substantially spherical contacting surface portion engaging said fingers,

said spherical contacting surface having its center aligned substantially on the axis of the cylindrical supporting surface and having a diameter substantially equal to the diameter of the cylindrical supporting surface,

said cylindrical supporting surface having a longitudinal extent sufficient to permit relatively unrestrained axial movement of said bearing member relative to said supporting surface.

References Cited by the Examiner UNITED STATES PATENTS 731,054 6/1903 Hoyt 303-147 742,178 10/1903 Fleming et al. 308147 796,981 8/1905 Anker-Holth 308-147 1,004,939 10/1911 Thorn 308147 1,168,453 1/1916 Anderson 308-147 1,306,653 6/1919 'Wingfield 308-72 XR 1,384,173 7/1921 Wikander 308-26 XR 1,767,371 6/1930 Kelso 308-72 X 2,606,795 8/1952 Hutton 30826 X DON A. WAITE, Primary Examiner.

MILTON KAUFMAN, ROBERT C. RIORDON,

Examiners. 

1. A SELF-ALIGNING BEARING STRUCTURE FOR A MOTOR SHAFT AND THE LIKE COMPRISING A BEARING MEMBER HAVING A RING AND A BORE FOR THE RECEPTION OF A SHAFT, A MOTOR HOUSING OR THE LIKE, AN EXTENSION HAVING ONE END THEREOF IMMOVABLY FIXED TO SAID MOTOR HOUSING AND CIRCUMSCRIBING A CYLINDRICAL SUPPORTING SURFACE AND HAS RADIALLY YIELDABLE PORTIONS, SAID BEARING MEMBER HAVING AN OUTER PERIMETER WHICH IS TRANVERSELY CURVED TO DEFINE A SUBSTANTIALLY SPHERICAL CONTACTING SURFACE PORTION, SAID SPHERICAL CONTACTING SURFACE HAVING ITS CENTER ALIGNED SUBSTANTIALLY ON THE AXIS OF THE CYLINDRICAL SUPPORTING SURFACE AND HAVING A DIAMETER SUBSTANTIALLY EQUAL TO THE DIAMETER OF THE CYLINDRICAL SUPPORTING SURFACE, SAID CYLINDRICAL SUPPORTING SURFACE HAVING A LONGITUDINAL EXTENT SUFFICIENT TO PERMNIT RELATIVELY UNRESTRAINED AXIAL MOVEMENT OF SAID BEARING MEMBER RELATIVE TO SAID SUPPORTING SURFACE. 